Arm rest



FIG. 1 is a back view of an arm rest.

FIG. 2 is a bottom view of the arm rest of FIG. 1.

FIG. 3 is a front view of the arm rest of FIG. 1.

FIG. 4 is an isometric view of the arm rest of FIG. 1.

FIG. 5 is a left-side view of the arm rest of FIG. 1.

FIG. 6 is a right-side view of the arm rest of FIG. 1; and,

FIG. 7 is a top view of the arm rest of FIG. 1.

The broken lines shown in the drawings are for the purpose of illustrating portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for an arm rest, as shown and described. 